Test the following on Clean, Standard and some other themes
Go to the grader report settings (Home / Site administration / Grades / Report settings / Grader report)
Enable the "Show ..." settings
Enable "Static students column"
Go to a course which contains a few gradable activities
Navigate to the gradebook (Grade report) and turn editing on
Make sure that the cell containing the student name is aligned with the cells containing the grades
Repeat without the "Static students column" setting